Abstract
Performance characteristics of a microchannel plate photomultiplier tube having a resistive anode readout were measured under a wide variety of applied potentials. Some general conclusions were reached regarding spatial resolution and counting efficiency. The photocathode-to-VMCP and VMCP applied potentials should be as high as possible, consistent with the dark-current performance and safe operation. The VMCP-to-ZMCP applied potential should be retarding, about −100 to −300 V. The ZMCP applied potential must be chosen to put the average pulse height in an optimum range for the position electronics and the gain values resulting from the VMCP and VMCP-to-ZMCP applied potentials. Finally, spatial resolution is a strong function of the ZMCP-to-anode applied potential, and a typical optimum value is 100 V. The smallest measured line-spread function full width at half maximum was approximately 50 μm.
Published Version
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